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things you SHOULDN’T be able to do with your “arduino” but you really can (HIGH voltages I/0 pins

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Would it be nice if you could apply larger voltages to the I/O pins on an Arduino? The data sheet says 5 V, but wouldn’t it be nice if you could use 12 V or even 24? Or how about 30 V? With a resistor, all this is possible.
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Ардуино
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